Genes & Cells

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SECONDHAND RISK Children appear more prone to eczema if their mom spent her pregnancy in a smoky home, a new study finds.

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GOOD NUTRITION Breast milk contributes to an intestinal mix of microbes in newborns that might suppress pet allergy risk later, a study finds.

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Two mutations allowed soil bacteria (Pseudomonas fluorescens) to re-evolve flagella: One pumped up levels of a protein than controls nitrogen uptake, and one that switched that protein’s job to flagella production control.